器具分类：维护页面树形结构

duhe

2025-05-30 1fee2ecedaaf4cff64d464f32a15e78863c73baa

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace SyntacticSugar.constant
{
    public static class EmptyConstant
    {
        /// <summary>
        /// 空
        /// </summary>
        public static int EMPTY = 0;
    }
}